function ecMenu(idname)
{var style=document.getElementById(idname).style;style.display=(style.display=="none")?"block":"none";}
function colID(idname)
{var style=document.getElementById(idname).style;style.display="none";}
function expID(idname)
{var style=document.getElementById(idname).style;style.display="block";}
function colClass(clsname)
{var eles=getElementsByClassName(clsname);for(var i=0;i<eles.length;i++){eles[i].style.display="none";}}
function expClass(clsname)
{var eles=getElementsByClassName(clsname);for(var i=0;i<eles.length;i++){eles[i].style.display="block";}}
function getElementsByClassName(clsname)
{var result=new Array();var elms=document.getElementsByTagName("div");for(var i=0;i<elms.length;i++){if(elms[i].className.match(clsname)){result.push(elms[i]);}}
return result;}